<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./vue.2.5.1.js"></script>
</head>

<body>

    <div id="app">
        {{msg}}
        <div>
            <span type="text" :title='msg'> 鼠标悬停显示</span>
        </div>
    </div>

    <script>
        var app = new Vue({
            el: '#app',
            data: {
                msg: 'sky'
            }
        })
    </script>
</body>